In the outstanding thesis of Benjaming D. Hennig, following picture is given: It shows how the world would look like if each country has geographic area proportional to its population. This is an example of contiguous cartogram and he discusses these more in his thesis, which is also published as a book, see Rediscovering the World

The failed replication of the marshmallow test does more than just debunk the earlier notion; it suggests other possible explanations for why poorer kids would be less motivated to wait for that second marshmallow. For them, daily life holds fewer guarantees: There might be food in the pantry today, but there might not be tomorrow, so there is a risk that comes with waiting. And even if their parents promise to buy more of a certain food, sometimes that promise gets broken out of financial ne…